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| author | Magnus Lång <[email protected]> | 2016-10-10 15:38:39 +0200 |
|---|---|---|
| committer | Magnus Lång <[email protected]> | 2016-11-16 17:22:04 +0100 |
| commit | e98df8fac977350b56319df621c65a823bfe86f4 (patch) | |
| tree | e67ceafe4d37333c29cf451fc2f6914feed78e8e /HOWTO | |
| parent | e1b9f467fbdb09aac9871e6064b67f87c8e59a47 (diff) | |
| download | otp-e98df8fac977350b56319df621c65a823bfe86f4.tar.gz otp-e98df8fac977350b56319df621c65a823bfe86f4.tar.bz2 otp-e98df8fac977350b56319df621c65a823bfe86f4.zip | |
hipe_tagscheme: Improve fixnum_addsub with imm
The addsub sequence was suboptimal when one of the arguments was
immediate, because it became an immediate alu followed by an immediate
alub, and the optimisers would not combine them due to the risk of
altering the branch. However, in this case we know that such a rewrite
is safe, and do it directly in hipe_tagscheme:fixnum_addsub/5 instead.
Diffstat (limited to 'HOWTO')
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